[Octave-bug-tracker] [bug #49990] cheby2 errors out if only asking for a single output.

[Nicholas Jankowski]

URL:
  <http://savannah.gnu.org/bugs/?49990>

                 Summary: cheby2 errors out if only asking for a single
output. 
                 Project: GNU Octave
            Submitted by: nrjank
            Submitted on: Thu 05 Jan 2017 07:31:11 PM GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Nicholas Jankowski
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.0
        Operating System: Any

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Details:

signal package cheby2 function produces an error for nargout ==1, Matlab
provides an output. 

Octave 4.2.0, signal 1.3.2

>> Q = cheby2(3,4,.5)
error: Invalid call to cheby2.  Correct usage is:
...


Matlab 2016b:

>> Q = cheby2(3,4,.5)
Q =
    0.5817    0.7479    0.7479    0.5817

>> [b,a]=cheby2(3,4,.5)
b =
    0.5817    0.7479    0.7479    0.5817
a =
    1.0000    0.5929    0.7382    0.3279

>> Q==b
ans =
  1×4 logical array
   1   1   1   1


from cheby2 code it looks like it should be a simple add at the end. I'm
putting together a set of simple output tests/hacks for bug #49318.  will try
to include this.




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